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<!DOCTYPE html>
<html>
<body>

<p>Click the button to display an alert box.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
alert("Hello! I am an alert box!");
}
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p>Click the button to display an alert box.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    alert("Hello! I am an alert box!");
}
</script>

</body>
</html>